Got my SPX yesterday
Glad I found this site, plenty of information and tips.
I read the stickies about the troubled history of the SPX and things to look out for, so I broke down my new SPX this morning to check things out before heading to the range. I found the front sight to be straight, extension tube straight with no burrs, spring length was 35.5", and there was minimal grease on the components. Since I did not find excessive grease like many new owners have found, I did not clean any components and decided to head out to the range.
I took 100 shells of Winchester birdshot (lead and steel shot), as well as a mix 100 shells of Rio 00B low recoil, winchester 00B HV, and Estate HV rifled slugs.
The entire time at the range was without problems. Everytime, I mixed the tube with different shells (slug, birdshot, 00B, slug, HV 00B, etc) the gas system handled them all without any problems. All the shells cycled quickly and ejected the spent shells about 8 feet away from me.
I took my 590A1 with me to compare and found the SPX handled and shouldered with a better feel to me. I would guess due to the slightly longer and heavier A1 barrel. I did find the A1 rear ghost sight to be better with the slightly larger diameter hole, but otherwise found the SPX to be better and more comfortable. I am happy with my second Mossberg and have already ordered a GG&G single point sling mount. I really like the quality of the SPX sights and the positive clicks when making adjustments.